Reversible propeller.



H. PAWLIK.

REVERSIBLE PBOPELLEB. APPLICATION FILED 8BPT. Z.1908.

954,539, Patented Apr. 12, 1910.

- UNITED STATES HUGO PAWLIK, OF UJ-PEST, AUSTRIA-HUNGARY.

REVERSIBLE PROPELIQEB.

Specification of Letters Patent; Patented ADI. 12, 1910- Application filed September 2, 1908. Serial No. 451,418.

T 0 all whom it may concern:

Be it known that I. Huoo PAWLIK, a subject of theKing of Hungary, and resident of Uj-Pcst. in the Kingdom of Austria-Hun gary, have invented certain new and useful Improvements in Reversible Propellers. of which the following is a specification.

The presentinvention relates to improvements in propellers for 'essels, the blades of which may be quickly and conveniently adjusted at any angle best adaptedto'Special conditions of use, and in which the blades are connected to be readily and conveniently shifted for propelling the vessel backward or forward without the necessity of revel-.2- in or stopping the engine.

fnmerous attem )tS have been made to construct devices of the character specified, but, as far as known. all of these devices have very serious defects. There are, for instance, known propellers, the blades of which are provided with spindles. which are slidably arranged in the hub of the propeller wheel. and are, for this reason, of comparatively small-cross sections, whereby that cross section of the blades. on which usually the maximum stress applied, too weak. Other devices have been constructed. in which the oscillatableblades are connected to the shifting means by means of a plurality-of levers. whereby a bulky and unreliable structure is obtained.

The object of the present invention now is to provide a propeller of the character, hereinbefore specified, which obviates the defects, herembeforc mentioned, and which is simple of constructirm, comparatively inexpensive of production. etlicient in operation, and in which the blades are ada )ted to be readily and conveniently shifted for pro polling the vessel backward or forward without the necessity of reversing or stopping the engine, and while rotating the propeller shaft. v

The invention is illustrated in the accompanying drawings, in"which I. Figure 1 is a vertical longitudinal section of a propeller. constructed according to the present invention. and Fig. 2 a plan view of the same, partly in section. Fig. 3 is a verti -al section of amoditication of the device,

and Fig. 4 a plan view of this modification.

Referring now more particularly to the drawings, the propcllcr shaft is indicated at. 0, upon which is: slidably mounted a sleeve (1, provided with a lteyscat a, engaging the key 0', carried by the propeller shaft 0. To t this sleeve a are secured the proper adjusting and reversing means. which comprise in this case plates b, 5. corresponding in number to the number of blades of the propeller, and slidabl y arrangedin the recesses of the hub 11, fixedly secured upon the end of the propeller shaft. Each of these plates 1) is provided with an arc-shaped slot in, engagmg substantially square blocks m, which 1n turn engage the square ends of the spindles l fixedly secured to the blades 0. The ropeller blades 0 are oscillatably secure to the huh (I by means of caps 72, which engage the enlarged sections f of the propeller blades-and form, preferably, roller bearings for the same.

The caps 12. are made of two parts, that is the innersection n and the outer section 12-, united with the hub (I by means of screw-bolts e. The section 22 of the cap n is preferably cast integral with the enlarged portion of the blade 0. milled together with said blade and its enlarged portion f, and thenseparated therefrom in any suitable manner. whereby a proper cooperation between the cap section '21" and the enlarged portion f of the propeller blade will be assured. It is obvious that when the cap n" is made of two halves. it must be divided' diametrically and the halves united in any suitable manner. It is obvious that the inner cap sections a may be done away with by jourualing the enlarged portion f of the blade in the huh (I.

By shifting the sleeve (1 and the plate 6, secured thereto. the angular relation of the square bloclv's m will be changed relative to the axis of the propeller shaft 0, and thus the relative angular position of the propeller blades varied. Owing to the arcshapcd construction of the slots 7., the square blocks in are compelled to move slightly at right angles to the direction of motion of the plates 7. F or this purpose the grooves maybe formed in plates 7), slidably arranged in the plates 1), as shown in Flgs. 1 and 2 of the drawings, or the square blocks 721 may be slidably arranged relative to'the square spindles/1 of the propeller blades 0, as shown in Figs. 3 and .4 of the drawings.

The operation ofthe device is obvious from the fore-" oing description. In shifting the plates 0, t 1e relative angular position of the square blocks m is changed owing to the. arc-shaped construction of the slots is, and,

of shiftable plates slidablv arrange since the spindle h of the blades are. also squared, the relative angular position of the b ades will in a similar manner be varied.

What I claim is: v

1. In a reversible propeller, the combination with a' propeller shaft of a hub secured thereto, a plurality of blades oscillatably mounted thereon, a corresponding lurality g in and inclosed by said hub and having arc-shaped slots, square spindles centrally arranged on said propeller blades and engaging said slots, and means forshifting said plates to vary the relative angular position of said blades at will.

2. In a reversible propeller, the combination with a propeller shaft, of a hub securedl thereto, a plurality of propeller blades,

. a corresponding plurality of caps made of two superimposed sections formin ball bearin s for securing said blades oscil fatably to sai hub, a plurality of shiftable plates slidably arranged in and inclosed by said hub and having arc-shaped slots, squared spindles centrally arranged on said propeller blades and engaging said slots, and means for shifting said plates to var the relative angular position of said bla es at will.

3. In a reversible propeller, the combination with a propeller shaft. of a hub secured thereto, a plurality of propeller blades, 9.

corresponding plurality of shiftable members arrange in and lncloscd by said hub, plates arranged in said shiftable members having arc-shaped slots and adapted to move at right angles to the axis of said propeller shaft, square spindles centrally arranged on said propellerblades and en agin said slots, whereby on moving said slnftable 'lll'llibGIS in the direction of the longitudinal members so as to allow of a relative movement in the direction at right angles to the axis of said propeller shaft between said spindles and said shiftable members, whereby on shifting the latter in the direction of the axis of the pro )ell'er shaft the an ular position of said bla es is varied, at wil Signed at Budapest, in the Kingdom of Hungary, this eleventh day of August, A. D,

' HUGO PAWLIK. \Vitnesses: MARCELL PA'ssroR,

MICHAEL T011311.

pluralitv of shiftable mem- 

